package com.sky.aspect;

import com.sky.annotion.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
/**
 * 切入点
 */
@Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotion.AutoFill)")
public void autoFillPointCut(){}

/**
 * 前置通知，在方法执行前进行执行
 * @param joinPoint
 */
@Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
    log.info("开始进行公共字段填充");
    //获取当前被拦截的方法上的数据库操作类型
    MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名对象
    AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的数据库操作类型
    OperationType value = autoFill.value();
    //获取当前被拦截的方法的参数，即实体对象
    Object[] args = joinPoint.getArgs();
    if (args == null || args.length == 0){
        return;
    }
    Object object = args[0];

    //赋值的数据
    LocalDateTime now = LocalDateTime.now();
    Long currentId = BaseContext.getCurrentId();
    if (value == OperationType.INSERT){
        //为插入操作的字段赋值
        //设置创建时间、更新时间、创建人、更新人
        try {
            Method setCreateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setCreateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateUser =object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            //通过反射为对象属性赋值
            setCreateTime.invoke(object, now);
            setUpdateTime.invoke(object, now);
            setCreateUser.invoke(object, currentId);
            setUpdateUser.invoke(object, currentId);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }else if (value == OperationType.UPDATE){
        //设置更新时间、更新人
        try {
            Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser =object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            //通过反射为对象属性赋值
            setUpdateTime.invoke(object, now);
            setUpdateUser.invoke(object, currentId);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }

    }

}
